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Washers & 'O' Rings

Shop o rings, sealing washers and o ring kits in standard metric and imperial sizes for hydraulic, pneumatic and plumbing connections. O rings fail in two ways: chemical incompatibility with the medium, and incorrect sizing. Check the bore and groove dimensions before ordering. Kits covering the most common sizes are available if you need a broad selection for maintenance use. Free delivery on orders over £200 to England and Wales.

  • REF #3824

    Rubber Washers

    Rubber Washers

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    £0.20 INC VAT
    £0.17 EXC VAT

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  • REF #3822

    Flat Copper Washer - Imperial

    Flat Copper Washer - Imperial

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    £0.49 INC VAT
    £0.41 EXC VAT

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  • REF #3833

    O-Ring - Imperial - Nitrile

    O-Ring - Imperial - Nitrile

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    £0.12 INC VAT
    £0.10 EXC VAT

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  • REF #3828

    Bonded Seal - Imperial

    Bonded Seal - Imperial

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    £0.28 INC VAT
    £0.23 EXC VAT

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  • REF #3823

    Fibre Washers

    Fibre Washers

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    £0.47 INC VAT
    £0.39 EXC VAT

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  • REF #3826

    Leather Washer

    Leather Washer

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    £0.35 INC VAT
    £0.29 EXC VAT

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  • REF #3832

    O-Ring - Metric - Nitrile

    O-Ring - Metric - Nitrile

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    £0.14 INC VAT
    £0.12 EXC VAT

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  • REF #3827

    Bonded Seal - Metric

    Bonded Seal - Metric

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    £0.38 INC VAT
    £0.32 EXC VAT

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  • REF #3821

    Flat Copper Washer - Metric

    Flat Copper Washer - Metric

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    £0.29 INC VAT
    £0.24 EXC VAT

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  • REF #3831

    Bonded Seal - Imperial - Stainless Steel - Viton

    Bonded Seal - Imperial - Stainless Steel - Viton

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    £4.24 INC VAT
    £3.53 EXC VAT

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  • REF #3825

    Nylon - Notched Washer

    Nylon - Notched Washer

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    £0.48 INC VAT
    £0.40 EXC VAT

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  • REF #3830

    Bonded Seal - Imperial - Stainless Steel - Nitrile

    Bonded Seal - Imperial - Stainless Steel - Nitrile

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    £2.06 INC VAT
    £1.72 EXC VAT

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  • O-Rings Splicing/Repair Kit

    O-Rings Splicing/Repair Kit

    £193.91 INC VAT
    £161.59 EXC VAT

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  • REF #3829

    Bonded Seal - Metric - Stainless Steel - Nitrile

    Bonded Seal - Metric - Stainless Steel - Nitrile

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    £8.98 INC VAT
    £7.48 EXC VAT

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O rings, sealing washers, and o ring kits

O rings seal by being compressed in a groove. The ring deforms against the groove walls and the mating surface, closing off the path between them. For that to work correctly, the o ring must be the right size for the groove — inside diameter (ID) and cross-section (CS) both matter. Measure the groove, not the o ring you're replacing, and match to standard sizing charts.

Material selection is the other critical variable. Nitrile (NBR) is the standard choice for oil, fuel, and compressed air at moderate temperatures. EPDM is used for water and steam applications. Viton (FKM) gives better chemical resistance and higher temperature performance and is the right choice for aggressive media or elevated operating temperatures. Check the medium, the temperature range, and the pressure before selecting.

O ring kits containing a broad range of sizes are stocked for maintenance applications where you need to find the right size on the spot rather than order specifically. Sealing washers — flat seals that compress under a fitting nut or bolt head — are also in this section and suit face-seal applications where a groove-seated o ring is not practical.

Frequently Asked Questions

How do I find the right o ring size?

O rings are sized by their inside diameter (ID) and cross-section (CS). Measure the bore or groove the o ring sits in, and the depth of the groove, to establish both dimensions. O ring sizing charts are available online and match nominal sizes to standard groove dimensions.

What material should my o ring be?

Nitrile (NBR) o rings are the standard choice for oil, fuel and compressed air. EPDM suits water and steam. Viton (FKM) is used for aggressive chemicals, fuels and high-temperature applications. Check the medium and temperature range before selecting.

Do you sell o ring kits with a range of sizes?

Yes. O ring kits covering a broad size range are available — useful for maintenance applications where you need to match sizes on the spot.

What is the difference between a sealing washer and an o ring?

A sealing washer sits flat against a mating surface to create a face seal, typically under a bolt head or fitting nut. An o ring sits in a groove and seals radially or axially depending on the application.

Do you deliver o rings and washers near me?

We deliver to England and Wales with free delivery on orders over £200.